Ukraine's security service said its Sea Baby drones have become "much more" powerful and can now strike Russian ships anywhere in the Black Sea.
Artem Dehtiarenko, a spokesperson for the SBU, said the drones have been upgraded to carry over a ton of explosives across over 1,000 kilometers, or about 621 miles, according to Ukrainian media outlets.
This is up from 800 kilograms and a distance of about 497 miles.
"Today, the SBU can attack enemy ships virtually anywhere across the Black Sea," he said, according to a translation by Ukrinform.
Dehtiarenko did not disclose the technical details but said that specialists from the Ministry of Internal Affairs, the Security Service, and others had created the "next-generation drones," per media outlet Rubryka.
He added that Sea Baby drones have been used to strike 11 Russian ships, including the patrol ship Pavel Derzhavin in October and the Olenegorsky Gornyak in August, per the outlet.